http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
"This is a revised and extended version of Fifteen Men, which first appeared in 1969, was updated in 1975, and became Sixteen Men, and then Eighteen Men."--Pref.
Includes bibliographical references and index.
Eighteen men : the prime ministers of Canada